13221321331 has 2 divisors, whose sum is σ = 13221321332. Its totient is φ = 13221321330.

The previous prime is 13221321283. The next prime is 13221321341. The reversal of 13221321331 is 13312312231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13221321331 - 2¹³ = 13221313139 is a prime.

It is a super-3 number, since 3×13221321331³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (13221321341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610660665 + 6610660666.

It is an arithmetic number, because the mean of its divisors is an integer number (6610660666).

Almost surely, 2^13221321331 is an apocalyptic number.

13221321331 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221321331 is an equidigital number, since it uses as much as digits as its factorization.

13221321331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 22.

Adding to 13221321331 its reverse (13312312231), we get a palindrome (26533633562).

The spelling of 13221321331 in words is "thirteen billion, two hundred twenty-one million, three hundred twenty-one thousand, three hundred thirty-one".